18735965197 has 2 divisors, whose sum is σ = 18735965198. Its totient is φ = 18735965196.

The previous prime is 18735965191. The next prime is 18735965233. The reversal of 18735965197 is 79156953781.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 14215554441 + 4520410756 = 119229^2 + 67234^2 .

It is a cyclic number.

It is not a de Polignac number, because 18735965197 - 2¹¹ = 18735963149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (18735965191) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 9367982598 + 9367982599.

It is an arithmetic number, because the mean of its divisors is an integer number (9367982599).

Almost surely, 2^18735965197 is an apocalyptic number.

It is an amenable number.

18735965197 is a deficient number, since it is larger than the sum of its proper divisors (1).

18735965197 is an equidigital number, since it uses as much as digits as its factorization.

18735965197 is an evil number, because the sum of its binary digits is even.

The product of its digits is 14288400, while the sum is 61.

The spelling of 18735965197 in words is "eighteen billion, seven hundred thirty-five million, nine hundred sixty-five thousand, one hundred ninety-seven".